Critical Vortex Shedding in a Strongly Interacting Fermionic Superfluid

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Title
Critical Vortex Shedding in a Strongly Interacting Fermionic Superfluid
Author(s)
Jee Woo Park; Bumsuk Ko; Yeongjae Shin
Publication Date
2018-11
Journal
PHYSICAL REVIEW LETTERS, v.121, no.22, pp.225301-1 - 225301-5
Publisher
AMER PHYSICAL SOC
Abstract
We study the critical vortex shedding in a strongly interacting fermionic superfluid of Li6 across the BEC-BCS crossover. By moving an optical obstacle in the sample and directly imaging the vortices after the time of flight, the critical velocity uvor for vortex shedding is measured as a function of the obstacle travel distance L. The observed uvor increases with decreasing L, where the rate of increase is the highest in the unitary regime. In the deep Bose-Einstein condensation regime, an empirical dissipation model well captures the dependence of uvor on L, characterized by a constant value of ��=-[d(1/uvor)/d(1/L)]. However, as the system is tuned across the resonance, a step increase of �� develops about a characteristic distance Lc as L is increased, where Lc is comparable to the obstacle size. This bimodal behavior is strengthened as the system is tuned towards the BCS regime. We attribute this evolution of uvor to the emergence of the underlying fermionic degree of freedom in the vortex-shedding dynamics of a Fermi condensate. ? 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5418
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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